cmake HAVE_DAYLIGHT examples

gammu/gammu CMakeLists.txt :243 

check_c_source_compiles ("
#include <time.h>

int main(void) {
    struct tm tm;
	tm.tm_isdst	= daylight;
    return 0;
}
"  HAVE_DAYLIGHT)

FlightGear/flightgear CMakeModules/CheckPOSIXFeatures.cmake :7 

check_variable_exists(daylight     HAVE_DAYLIGHT)